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Sun
Sun news: Solar wind gust could spark auroras
Sun news September 23, 2026: NOAA issued a G1 storm alert as coronal hole wind arrives tonight. Could the equinox effect give auroras a boost?
September 23, 2026
Earth
Hurricane Polo lurks off Mexico, now Category 4
Hurricane Polo has weakened to Category 4 as it moves north along Mexico's southwestern coast. It had strengthened from a tropical storm to Category 5 in a day.
September 23, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: The Harvest Moon is coming up. Watch a livestream today at 12 noon CDT (17 UTC) for Harvest Moon science and folklore.
September 23, 2026
Human World
Neptune discovered on this date 180 years ago
Read the fascinating story of the discovery of Neptune - 180 years ago - on September 23, 1846. It was the 1st planet to be discovered by using mathematics.
September 23, 2026
Space
Today's Image
Earth images from space: 13 incredible photos of our planet
Look at these Earth images from space. How does it make you feel about the planet you live on and about Earth's place in the solar system and cosmos?
September 23, 2026
Clusters Nebulae Galaxies
The Andromeda Galaxy: All you need to know
The Andromeda Galaxy is the closest large galaxy to our Milky Way. At 2.5 million light-years, it's the most distant thing you can see with the eye alone.
September 23, 2026
Earth
Fat Bear Week 2026: Here’s how to participate!
It's time for Fat Bear Week 2026! Vote for your favorite corpulent cutie as the brown bears of Katmai National Park fatten up for winter.
September 22, 2026
Astronomy Essentials
Are day and night equal on the equinox? Not exactly
Are day and night equal at an equinox? No. There's slightly more day than night on the day of an equinox. Find out why here.
September 22, 2026
Space
JUICE mission to fly by Earth next week! Details here
The JUICE mission will perform a flyby of Earth next week on September 28. The spacecraft is headed toward Jupiter's icy moons, where it will arrive in 2031.
September 22, 2026
Human World
6th batch of Pentagon UAP files: Air Force talk and more
The 6th batch of the Pentagon UAP files has just been released. Read about a U.S. Air Force talk on UAP from 1952, see more videos and more.
September 20, 2026
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